Question: Who was the head of the government of Essen at the beginning of 1949?
Paraphrase: Who was the leader of the Essen government at the commencement of 1949?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q2066 p:P6 ?s . ?s ps:P6 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1949')) }